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GOODWILL AND INTANGIBLE ASSETS - Purchased Intangible Assets (Details) - USD ($) $ in Millions | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Gross | $ 1,995.6 | $ 2,000.1
Accumulated Amortization | (776.4) | (753.1)
Net | 1,219.2 | 1,247.0
Purchased data files |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Gross | 953.5 | 955.7
Accumulated Amortization | (272.5) | (262.2)
Net | 681.0 | 693.5
Acquired software and technology |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Gross | 144.0 | 142.3
Accumulated Amortization | (75.1) | (66.6)
Net | 68.9 | 75.7
Customer relationships |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Gross | 776.2 | 772.4
Accumulated Amortization | (336.0) | (326.7)
Net | 440.2 | 445.7
Reacquired rights |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Gross | 73.3 | 73.3
Accumulated Amortization | (68.9) | (65.6)
Net | 4.4 | 7.7
Proprietary database |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Gross | 23.2 | 22.1
Accumulated Amortization | (9.2) | (8.7)
Net | 14.0 | 13.4
Non-compete agreements |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Gross | 4.4 | 14.1
Accumulated Amortization | (3.0) | (12.7)
Net | 1.4 | 1.4
Trade names and other intangible assets |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Gross | 21.0 | 20.2
Accumulated Amortization | (11.7) | (10.6)
Net | $ 9.3 | $ 9.6

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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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